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CP640 is a High Density Polyethylene (HDPE) sheet used to provide an impermeable root-proof barrier.

CP640 is used in conjunction with the CP250 waterproofing system. Once installed over the cured membrane, CP640 protects the membrane from root penetration in green roof systems, planters and similar installations.

CP640 is installed over the cured membrane. Cut to length and / or shape using a sharp knife. To achieve a high integrity barrier, all seams should be thermally welded. In less critical situations a 600 mm overlap can be used, or 150 mm with overlap and taped seams.